that is education. i think of the national level or state level rules for sort of outcomes in education. i'm looking at this map and as you pointed out, not only is it is map where crime is in the city, it's a map where you have low performing schools. ought we not put lead on top of our outcomes and not saying you have to close your school because you are dealing with students who are lead poisoned. >> correct. the mapping of a city is really easy to do. it's much -- ethically, it's more important to do something like that where you get at the source than measure blood level. we use the child to indicate what is environment is like and try to turn it around to primary prevention in measuring the environment and try to prevent the child from getting exposed. it turns out soil is very easy to measure the amount of lead in soil. we are doing a lot of work in the city of new orleans to try to advance changing the environment so that children don't get exposed. >> i really appreciate that shift. rather than